Blocking Transmission Cooler - PeachParts Mercedes-Benz Forum

uberwasser · #1 09-01-2014, 09:10 PM

It's good to be aware that while the engine and transmission are both heating up, the radiator also acts as a "heater" for the transmission fluid helping it reach operating temp (about 80*C) sooner. By installing a separate transmission cooler, others on this site have found (via monitoring transmission fluid temp gauges they installed) that the transmission would not warm up for a very long time, if at all. Some stated it took extended freeway driving for it to reach operating temp. This is not good, in the long run.

Therefore, this suggests that once you're ready to replace the radiator, that you should route the lines so that the fluid passes through the transmission cooler integrated in to the radiator as well as the new cooler. You can keep both - you'll simply have greater cooling capacity for those times you have heavy loads or are traversing hilly terrain.

Adriel · #2 09-01-2014, 09:19 PM

Quote:

Originally Posted by uberwasser

It's good to be aware that while the engine and transmission are both heating up, the radiator also acts as a "heater" for the transmission fluid helping it reach operating temp (about 80*C) sooner. By installing a separate transmission cooler, others on this site have found (via monitoring transmission fluid temp gauges they installed) that the transmission would not warm up for a very long time, if at all. Some stated it took extended freeway driving for it to reach operating temp. This is not good, in the long run.

Therefore, this suggests that once you're ready to replace the radiator, that you should route the lines so that the fluid passes through the transmission cooler integrated in to the radiator as well as the new cooler. You can keep both - you'll simply have greater cooling capacity for those times you have heavy loads or are traversing hilly terrain.

I have seen that in my research, so thank you so very much for confirming this!

For now, just trying to get back on the road. Hopefully Amazon will actually deliver as promised, but not holding my breath!

What damage is caused by having too cool of a transmission?

How would I integrate the stock cooler if I was to keep the external oil cooler?

Adriel · #3 09-01-2014, 09:59 PM

Would have posted sooner, but the princess needed me!

I found it!

http://www.summitracing.com/parts/rus-640830/overview/

http://www.summitracing.com/parts/der-98200/overview/

The flow should be from the supply to the external cooler, to radiator cooler, then out to the return, right?

It rarely gets below 80*F most of the time here, F.Y.I..

Adriel · #4 10-21-2014, 03:31 AM

Man time flies by when designing!

It wasn't too long ago it was 8:00P.M.

Anyway, like y'all's opinion on this. My preference is not to have barb fittings, as leery of them popping off. Further, the external cooler be mainly due to me burning up the clutches, and don't want to do that again. Figure when it gets below 64*F then use cardboard to block the cooler?

So, is both sides of the transmission hose the same size?

Supply (driver's side) hard line, 16mmx1.5 to AN6 adapter, braided high pressure hose (braided to protect against the belts), AN6 to 3/8"NPT on the external cooler. Then the fluid goes through the cooler. AN6 to 3/8" adapter, AN6 hose, 16mmx1.5 to AN6 adapter on internal oil cooler. The fluid then goes through the internal oil cooler, so as picks up engine heat, allowing the transmission to have proper, quick, warm up.